#include <hidef.h>      	/* common defines and macros */
#include "derivative.h"		/* derivative-specific definitions */
#include "delay.h"

//function prototypes
void update_seven_segment(void);
void setClk(void);

//initialize variables as unsigned chars (or unsigned bytes)
unsigned char mill = 0;
unsigned char tenths = 0;
unsigned char secs = 0;
unsigned char tenSecs = 0;
unsigned char minutes = 0;
unsigned char select = 0;
unsigned char disp_data[4];
unsigned char disptn[4];


unsigned char lastbuttons = 0;
unsigned char repeat = 0;
unsigned char runflag = 0;     //only update clock if set

//array for seven segment pattern
const unsigned char segm_ptrn [38] = {
  0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
  0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,
  0x3d,0x76,0x74,0x1e,0x38,0x54,0x63,0x5c,
  0x73,0x50,0x78,0x3e,0x1c,0x6e,0x08,0x40,
  0x00,0x01,0x48,0x41,0x09,0x49
};


void main(void) {
	//initialize Dragon12 board ports
	setClk();
	PTP  = 0xFF;  //turn off 7-segment display
	DDRB = 0xFF;  //portb = output
	DDRP = 0xFF;  //portp = output
	DDRJ = 0xFF;  //make port J an output port
	PTJ  = 0xFF;  //make PJ1 high to disable LEDs
	DDRH = 0x00;  //initialize buttons



	EnableInterrupts;


	while(1) {
		/**** update clock using your own code here ****/
		delayby50us(4);
		mill++;
		if(mill==100) {
		  tenths++;
		  mill=0;
		  if(tenths==10){
		    secs++;
		    tenths=0;
			if(tenSecs==6){
			  minutes++;
			  tenSecs=0;
			  secs=0;
			}else if(secs%10 == 0){
			  tenSecs++;
			  secs=0;
			}
		  }
		}



		disp_data[0]= minutes;
		disp_data[1]= tenSecs;
		disp_data[2]= secs;
		disp_data[3]= tenths;


		/**** update the numbers on seven segment ****/


		update_seven_segment(); //updates what is shown on the seven segment
   }
}

void update_seven_segment(void) {
	int i = 0;

	//get segment pattern for each number
	for(i=0;i<4;i++)
		disptn[i] = segm_ptrn[disp_data[i]];

	//multiplexing display one digit at a time
	//digit0:
	PORTB = disptn[3];
	PTP &= ~0x08;
	PTP |= 0x07;
	delayby50us(4);

	//digit1:
	PORTB = disptn[2];
	PTP &= ~0x04;
	PTP |= 0x0B;
	delayby50us(4);

	//digit2:
	PORTB = disptn[1];
	PTP &= ~0x02;
	PTP |= 0x0D;
	delayby50us(4);

	//digit3:
	PORTB = disptn[0];
	PTP &= ~0x01;
	PTP |= 0x0E;
	delayby50us(4);
}

//this function must be called once to set up clock with correct speed
void setClk(void){
	REFDV = 0x00;
	SYNR = 0x02;
	PLLCTL=0x60;
	while(CRGFLG&0x08 == 0x00){  //busy wait
	}

	CLKSEL|=0x80;
}